She received a Master of Philosophy degree from the Union Theological Seminary in New York City in studies focusing on religion and education, and was ordained to the diaconate of the Episcopal Church in 1972.

[1] While with Hill & Barlow, Hewitt served on charitable, civic, and professional boards and committees and as a continuing education lecturer on real estate law.

Hewitt was commissioned as a judge of the United States Court of Federal Claims by President Bill Clinton on October 22, 1998.

[1] In 2006, she was appointed by Chief Justice John G. Roberts to serve on the Financial Disclosure Committee of the Judicial Conference of the United States.

[1] Hewitt is married to Eleanor D. Acheson (born 1947),[2] who served as Assistant Attorney General of the United States during the Clinton Administration.